用电弧炉熔炼法制备了新的三元金属间化合物Ce5AgBi3, 用Rietveld方法对其结构进行了精修, 该化合物为Hf5CuSn3结构(空间群p63/mcm), 其中Ce、Ag和Bi分别占据Hf、Cu和Sn的位置, 晶胞参数为: a=b=9.7163(3)A, c=6.6228(2)A, V=541.47(5)A3. 该结构特点是沿着c轴方向的层状结构. 其中6g的Ce和Bi组成六边形网状平面结构, 2d的Ag和4f位置的Ce分别占据由Ce-Bi六边形所形成的沿着c轴方向的两种隧道中. 用PPMS对Ce5AgBi3的磁性和比热性能做了分析. 该化合物低温下为反铁磁性, 奈尔温度为3.8K, 高温时符合居里-外斯定律, 有效磁量子数为2.67μB, 表明其磁矩都是由Ce3+提供.
The title new compound Ce5AgBi3 was synthesized by arc melting method followed by annealing. The crystal structure refined using Rietveld method and X-ray powder diffraction data shows that it is similar to Hf5CuSn3 with space group p63/mcm (No.193). The unit cell parameters are a=b=9.7163(3)A, c=6.6228(2)A and V=541.47(5)A3. The structure is characterized by layers of Ce-Bi net formed by Ce and Bi at 6g position. Ce at 4f position and Ag at 2d position are separated in those two different kinds of Ce-Bi hexagon tunnels along c axes, respectively. Magnetism and specific heat property of Ce5AgBi3 are measured using PPMS. Ce5AgBi3 is antiferromagnetism and complies with Curie-Weiss law above TN=3.8K. The calculated moment is 2.67μB, fitted well with μeff of Ce3+，which means that the magnetism of Ce5AgBi3 is mainly offered by Ce3+.
[1] Steglich F, Aarts J, Bredl C D, et al. Phys. Rev. Lett., 1979, 43 (25): 1892--1896.
[2] Rikio S, Tetsuya T, YoshichikaO. J. Phys. Soc. Japan, 2007, 76 (5): 051003. [3] Takagi S, Kimura T, Sato N, et al. J. Phys. Soc. Japan, 1988, 57 (5): 1562--1568.
[4] Christianson A D, Gardner J S, Kang H J, et al. J. Mag. Mag. Mat., 2007, 310 (2): 266--267.
[5] Miyako Y, Takeuchi T, Taniguchi T, et al. Z. Physik B Cond. Matter., 1996, 101 (3): 339--343.
[6] Tran V H. J. Alloy Comp., 2004, 383 (1-2): 281--285.
[7] Kitagawa J, Takeda N, Ishikawa M. Phys. Rev. B, 1996, 53 (5): 5101--5103.
[8] Zapf V S, Frederick N A, Rogers K L, et al. Phys. Rev. B, 2003, 67 (3): 064405. [9] Hohnke D, Parthe E. J. Less-Common Metals, 1969, 17 (3): 291--296.
[10] Aksel’rud L G, Grin Y N. XIIth European Crystallogr. Meeting, Moscow 3. 1989. 155.
